I'd like to interrupt the flamin' rage and madness to give you the collectable guide for LIRR! Up on Steam now, you can use the guide to find all the collectables you need for the Discovery Island achievement, and a few more too. Remember that these guides apply to all platforms, so even if you aren't on PC, you can use this guide to get that achievement. And I usually don't mention this, but please, thumbs up the darn guide people! Seriously, I have some guides with more favorites than ratings. (Who the heck favorites but does not rate?) Nobody other than you is going to see this stuff if it doesn't actually get ratings.
I don't have LIRR but I've given you a thumbs up anyway as I used your NEC one and you'd done a good job with that one. Just an FYI, the link is broken.
Thanks for the guide there is no Vanderbilt Station on the Xbox One platform instead there is Weatside Yard and Morris Park. Stuck at finishing Discovery Island.